Multisystem tube



April 19, 1938. B. WIENECKE MULTISYSTEM TUBE Filed Feb. 5, 1934 UNITED STATES PATET MULTISYS'IEM TUBE Bruno Wienecke, Berlin, Germany Application February 5, 1934, Serial No. 709,705

In Germany February 6, 1933 4 Claims. (Cl. 250-275) The subject matter of the present invention is tact between the anodes and the strips of mica, a novel arrangement of the electrode systems in which might lead to disturbances, particularly multi-system tubes for mounting the systems to when the system is loaded, by heating the anodes,

be free of vibration, and a method of obtaining small spacers are provided, for example of ceramic 5 a rigid assembly of the systems. The arrangematerial, which upon the assembly of the total 5 ment and the method are for use both in consystem structure are slipped over the cross bars nection with rectifier tubes, and more particularly secured to the anodes.

FFiE

two-way rectifier tubes, as well as for power The assembly of the total system on the pine amplifier tubes and transmission tubes, insofar in accordance with the invention is now peras these possess a plurality of systems. formed in such fashion that the total system rests 10 It has been found that without the arrangeupon the pinch merely by means of the mica ment of the systems according to the invention braces in two-point or two-surface contact, a displacement of the systems or the single parts possibly with rectangular or trapezoidal crossthereof frequently takes place by the vibration section. The diagonal braces are provided at a of these tubes of relatively high output. Owing suitable point, preferably at the centre, with a to this relative displacement of the systems or small metal plate, which may conveniently be system parts the tube data is naturally a difsecured to said braces by riveting. Said metal ferent one, and the tubes are thus made inplates are secured, preferably by spot welding, to capable of use. short holding rods, which are fused into the pinch A, It has also been found that in the production and secure in this way the entire system in its 20 of tubes of relatively high output as hitherto position on said pinch. known the most frequent error in manufacture The filaments which may preferably be V- consists in rupture or fracture of the pinch. This shaped are held by means of resilient leads conis due to the fact that the electrodes, and more nected to each. of the ends of the filament. The V particularly the anodes, are secured in direct centre-point of the filament is held firmly on a 25 fashion to the leading or holding rods fused cross strut between the diagonal braces. To supinto the glass pinch. In the heating of the meport the current leads for the cathode there is ta l a s sa y for u s s s p s provided in. accordance with the invention a there occurs, however, a strong conduction of transverse bracing, preferably composed of mica, heat over these short holding rods to the glas between the diagonal braces on either side, which 30 pinch, so that inadmissible thermal stresses are transverse bracing ensures a sufficient spacing produced, which may lead to rupture of the pinch. between the current leads. By reason of the It may also occur on occasion that, owing to arrangement according to the invention it is overloading during operations, m p r y accomplished that insofar as the electrodes of a the anodes become excessively heated, and that certain system possess a certain freedom of o in this Ca the glass D -0 m y b co e movement at all in relation to each other, these fractured owing to conduction of the heat. electrodes, for example the cathodes of the sys- ACCOrding OW to the ve t o the electrode tern, are unable to move the direction from systems are fir united to f rm a rm selfom anode to cathode, but only in a direction vertitained mechanical structure. This is performed cal thereto. This is particularly important in the ll) in such fashion that the single electrode systems a of tifi t i hi h th spacing r so supported n r l t n to e h h r by between cathode and anode is extremely small. means 0f d l b aces that the systems have The assembly of the systems according to the no possibility whatsoever of moving in relation invention is illmtrated in the drawing in con- O ea h ot r. he diagonal b e are prod ced junction with a possible form of embodiment of a from a highly insulating material, which may be two-way rectifier. re ly outgassed, for x l mi n ar Fig. 1 is complete View of the system accordconnected together at the point of intersection. m t th invention, while in 2 th i The diagonal braces, E y also be D shown an elevation and in Fig. 3 a plan of the duced in one piece, which conveniently is in the syste n ith the same reference characters as 50 form of an X. To these there are secured in in Fig. 1. Y accordance with the invention cross bars for In Fig. 1, l is the glass pinch having the pump holding the electrodes, for example the anodes, tube 2 attached thereto, 3 and i the box-shaped w h r are mounted firmly in r p nding anodes, and s and s the cathodes guided in the borings in the diagonal braces. To avoid conform of a V. In the pinch there are fused the 5 holding rods 1 and 8, which at the same time are constructed to form leads for the anodes. Over these holding rods there is slipped and secured the structure carrying the systems. The anode systems are connected with each other by means of the cross-members 9 and ID. This connection causes on the one hand the combination of the electrode systems to form a mechanical unit, and on the other hand, insofar as relative displacement of the electrodes is still possible at all, provides security against the danger of short-circuiting and other electrical disadvantages. 9 and I!) are the diagonal braces according to the invention, which consist of a highly insulating material readily capable of being outgassed, for example of mica, and are in the form of an X. They are bored at the ends, and carry the anodes by means of transverse bars 22 and 23 secured thereto, spacers 28, composed for example of ceramic material, being provided to avoid contact between the anodes and the pieces of mica. There are also fused into the pinch a middle holding rod II and the leads l3 and M for the cathodes 5 and 6. The spacing between these electrodes is ensured by means of a cross strut IS. The fixed holding of the filaments at the bottom is performed by means of the transverse rod 2! with the abutment 26, whilst the upper lead is constructed to be elastic by means of the resilient yokes 24 or 25 for each filament. The pieces of mica 9 and I0 carry at the centre a circular metallic disc l6, which is riveted firmly to the mica itself. By means of the bent abutments I! and I8 furnished with apertures the rigid system structure is slipped over the holding rods 1 and 8 until it rests firmly at two points or surfaces against the pinch at I2, and is then welded to the rods 1 or 8 with the assistance of the plate l9. At the same time there are also welded to this plate l9 asuitable getter material 20, for example, magnesium, and 1 the anode lead 21.

It is also possible, in addition to the electrode systems assembled in accordance with the invention, to fit coupling elements in the same vacuum space, or to provide any additional electrode systems, which are not assembled in the manner according to the invention.

The particular and essential features of the present invention are to be regarded in the fact that (1) The bracing of the systems or system parts in relation to each other is performed by means of diagonal braces,

(2) The centre of gravity of the total system structure is disposed as low as possible, preferably below the supporting points for the system on the pinch,

(3) The diagonal braces may each be produced from a strong and preferably X-shaped piece of material,

(4) The total system is mounted by (twopoint or two-surface) bearing of the diagonal braces against the pinch, and additional holding is performed by securing the total system to holding rods, preferably by means of spot weld- (5) The arrangement is such that no heatconductive connection exists between the anodes and the pinch, and a heat insulation is provided between the anodes and the pieces of mica,

(6) The cathodes, which are preferably guided in the form of a V, are secured on the one side to a transverse strut, which is mounted on the diagonal braces, and at the two other ends are secured resiliently in respect of each filament section to avoid any irregular or insufficient tension of these filament sections.

I claim:

1. In an electron discharge device a stem having a press portion, two cathodes, two box-shaped anodes, two diagonal braces consisting of a highly insulating and highly vacuum-proof material, the ends of said braces connected with each other by four transverse rods and with said anodes forming a mechanical unit without heat-conductive connections, said unit being rested upon said press portion in two-point contact by means of said diagonal braces, the centre of gravity of said unit situated below the upper surface of said press portion.

2. In an electron discharge device a stem having a press portion, two cathodes, two boxshaped anodes, two diagonal braces consisting of a highly insulating and highly vacuum-proof material, the ends of said braces connected with each other by four transverse rods and with said anodes forming a mechanical unit without heatconductive connections, said unit being rested upon said press portion in two-point Contact by means of said diagonal braces, the centre of gravity of said unit situated below the upper surface of said press portion, said diagonal braces secured against displacement by additional holding means comprising holding rods fused in the press portion and connectedwith metallic discs fixed in the centre of said diagonal braces.

3. In an electron discharge device a stemhaving a press portion, two cathodes, two boxshaped anodes, two diagonal braces consisting of a highly insulating and highly vacuum-proof material, the ends of said braces connected with each other by four transverse rods and with said anodes forming a mechanical unit without heat conductive connections, said unit being rested upon said press portion in two-point contact by means of said diagonal braces, the centre of gravity of said unit situated below the upper surface of said press portion, a heat insulation comprising spaces of ceramic material provided between said anodes and said diagonal braces.

' 4. In an electron discharge device a stem having a press portion, two cathodes, two box-shaped anodes, two diagonal braces consisting of a highly insulating and highly vacuum-proof material, the ends of said braces connected with each other by four transverse rods and with said anodes forming a mechanical unit-without heatconductive connections, said unit being rested upon said press portion in two-point contact by means of said diagonal braces, the centre of gravity of said unit situated below the upper surface of said pressportion, the lower end of said cathodes secured firmly on a transverse strut mounted on said diagonal braces, the upper ends of said cathodes being held in resilient fashion, cathode leads supported by a transverse bracing mounted in said diagonal braces.

BRUNO WIENECKE. 

